Use of unresolved identifier 'objectAtIndexPath' - ios

Question

I am working on an app that allows you to 'Like' posts. I was implementing the like button, but I got an error that I cannot seem to fix.
I searched in another posts, but I'm unsure of how to fix it.
This is the code I'm using to implement the like button. Do I need to import something into my project? Or unwrap at certain point?
Any help is appreciate it.
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell {
let cell:PostTableViewCell = tableView!.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath!) as! PostTableViewCell
let post = self.objectAtIndexPath(indexPath!) as PFObject
cell.postTextView.alpha = 0
cell.usernameLabel.alpha = 0
cell.timestampLabel.alpha = 0
cell.postTextView.text = post.objectForKey("content") as! String
var dataFormatter:NSDateFormatter = NSDateFormatter()
dataFormatter.dateFormat = "yyyy-MM-dd HH:mm"
cell.timestampLabel.text = dataFormatter.stringFromDate(post.createdAt!)
// to get username from the post
var showUsername:PFQuery = PFUser.query()!
//the objectID is the same as the user in the two different tables
showUsername.whereKey("objectId", equalTo: post.objectForKey("user")!.objectId!!)
showUsername.findObjectsInBackgroundWithBlock{
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil{
let user = (objects as! [PFUser]).last
cell.usernameLabel.text = user!.username
UIView.animateWithDuration(0.5, animations: {
cell.postTextView.alpha = 1
cell.usernameLabel.alpha = 1
cell.timestampLabel.alpha = 1
})
}
}
return cell
}
func objectAtIndexPath(indexPath: NSIndexPath) -> PFObject {
return self.timelineData[indexPath.row] as! PFObject
}
#IBAction func likeButton(sender: UIButton) {
//disables the like button so it can't be pressed again
sender.enabled = false
sender.userInteractionEnabled = false
sender.alpha = 0.5
//get the point in the table view that corresponds to the button that was pressed
//in my case these were a bunch of cells each with their own like button
let hitPoint = sender.convertPoint(CGPointZero, toView: self.tableView)
let hitIndex = self.tableView.indexPathForRowAtPoint(hitPoint)
let object = self.objectAtIndexPath(hitIndex!) as PFObject
//this is where I incremented the key for the object
object.incrementKey("likes")
object.saveInBackground() //still gives me error here
self.tableView.reloadData()
NSLog("Top Index Path \(hitIndex?.row)")
}
Update2: Added a photo of the error

Answer 1

Since the view controller is neither an NSFetchedResultsController or a PFQueryTableViewController, you'll have to implement objectAtIndexPath: yourself.
A hint about the code you need is in cellForRowAtIndexPath':
let post:PFObject = self.timelineData.objectAtIndex(indexPath!.row) as! PFObject
Dispensing with the objectAtIndex method on array, just index into the array at the row:
func objectAtIndexPath(indexPath: NSIndexPath) -> PFObject {
return self.timelineData[indexPath.row] as! PFObject
}
Call it wherever the old code appears like this (in likeButton)...
let object = self.objectAtIndexPath(hitIndex) as! PFObject
or, in cellForRowAtIndexPath:...
let post = self.objectAtIndexPath(indexPath) as!PFObject
etc.